<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>
    
</body>
</html>
<script>
    var arr=[1,2,3,4,5]
    var brr=[4,5,6,7,8]
    
    function hbqc(arr,brr){
        var crr=arr.concat(brr)
        var drr=[]
        crr.forEach(function(ele,i){
            if(drr.indexOf(ele)==-1){
                drr.push(ele)
            }
        })
        return drr
    }
    console.log(hbqc(arr,brr));
    
</script>